Multiple lamp mount



March 22, 1938. E. ROSS ET AL 2,111,807

MULTI PLE LAMP MOUNT Filed Nov. 14, 1935 2 Sheets-Sheet l lllllll INVENTORS Ell-111151 R1155 BY E1132 ATTORNEY March 22, 1938. E. ROSS ET AL 2,111,807

MULTI PLE LAMP MOUNT INVENTORS \\\\\\\WIW/////X///// 40 ATTORNEY Patented Mar. 22, 1938 UNITED STATES PATENT OFFICE MULTIPLE LAMP MOUNT Application November 14, 1935, Serial No. 49,769

8 Claims.

This invention relates to sound motion picture systems and apparatus, and particularly to a multiple mounting for eXciter lamps used in such systems.

The present invention is directed to an. apparatus for quickly changing from one lamp to another Without appreciable interruption of the sound translation. A multiple lamp holder is provided which, in view of the non-uniformity of construction of the lamps, may be adjusted for each lamp prior to its actual use. Another feature of the holder is that it enables removal and replacement of burnt-out lamps without interruption of service.

As the principal object of the invention is to prevent interruptions in service of sound reproduction caused by burnt-out or deteriorated exciter lamps, a group of lamps is placed in a novel mounting which permits individual adjustment of the position of each lamp in its operating position before use. The adjusting means is simple and adjustment can be made rapidly when a new lamp is inserted in the holder. In brief, the mounting is a turret provided with three lamp positions, the contacts to the lamps being made in operating position and removed in the other positions. Although a common element is employed for the adjustment of each lamp in a vertical direction, nevertheless this adjustment does not disturb the vertical position of the other lamps. A turn of one-third revolution simultaneously removes the defective lamp and substitutes a new one.

Other objects and features of the invention, and the invention itself, will be more fully understood from the following description read in conjunction with the accompanying drawings, in

which Fig. 1 is a side elevational View of a sound reproducing apparatus employing a preferred form of my invention.

Fig. 2 is a plan view of the lamp mounting showing the arrangement of the lamps.

Fig. 3 is a rear view of the mounting; and

Fig. 4 is a sectional side view.

Referring to Fig. 1, the sound reproducing apparatus is mounted in a casing 5 having two compartments 6 and I separated by a wall 8. An exciter lamp 9 positioned in a mounting l adjustably fastened to the rear wall of easing 5, as by means of screws ll, furnishes constant intensity light when energized from a suitable source of supply (not shown).

A film I3 is fed from a supply reel (not shown) through an opening 14 formed in the upper wall of easing 5, between. two guide rollers l and 16. The film then passes around an edge guiding roller El and over an impedance roller i8, thence between impedance roller 18 and spring pressure rollers 19 past a translation point 2i positioned between a gate 12 and an aperture shoe 20. From there the film passes over a drive sprocket 22 and its accompanying pressure rollers 23 and 24 to a take-up sprocket (not shown) over a roller 25 and to a take-up reel (not shown).

The light from the exciter lamp 9 passes. through an optical system 26 and is focused at the translation point 2|. From there it passes through the film l3 onto a light sensitive cell mounted in a holder 2'1.

The film mechanism and optical system assembly have been fully described and claimed in co-pending application Serial No. 48,278, filed Nov. 5, 1935, and form no part of the present invention.

Referring now to Figs. 2, 3 and 4, the exciter lamp 9 andauxiliary lamps 30 and 3| are positioned in recesses 32, 33 and 34 in a revolving holder 35, fixedly mounted on a vertical shaft 36. The shaft 36 is rotatably mounted in a bearing 3'! and is held in position by means of collars 38 and 39. The shaft 36 is insulated from the bearing 31 by means of a bushing 28 and spacers 29 provided for that purpose. The lower end of the shaft 36 extending through the casing 5 is provided with a knurled knob 40 and an insulated sleeve 4|.

The bearing 3! is part of a bracket 43 which is provided with elongated holes 44 for mounting on the rear wall of compartment 6. A groove 45 5 serves to guide the lamp holder 10 in a transverse direction on a block (not shown) affixed to the rear wall of compartment 6.

A terminal strip of insulating material 46 is secured to the bracket 43 as by means of screws 41. The insulating strip 46 has affixed to it, by means of screws 49, a block 48 with a counterbored hole 50 disposed substantially below the center of the exciter lamp 9.

An insulating sleeve 5! having a beveled top 45 portion 52 is located in the hole 50 and is maintained in a countersunk hole in an insulating disc 53 by means of a helical spring 54. The insulating plate 53 is secured to the holder 35 by means of screws 55, and has countersunk holes positioned under each of the exciter lamps 9, 30 and 3| adapted to receive the beveled top 52 of the sleeve 5|. Thus the sleeve 5| serves as a locating means for aligning the lamp 9 with the optical system 26.

A contact plunger 51 having an enlarged top portion 58 and rounded top surface 59 is located within the insulating sleeve and extends through a small hole 60 in the bottom of the block 48. A helical spring 56 between the bottom of the hole 50 and the enlarged top portion 58 of the plunger 51 maintains the plunger against the bottom of the lamp 9. The plunger 51 serves as a. means for vertically positioning the filament of lamp 9 with respect to the optical system 26, as will be hereafter described. It also serves as an {electrical contact from the tip of the exciter lamp 9 to the terminal 6| secured to the terminal strip 46 by means of screws 49.

The other side of the electrical circuit is as follows: Terminal 62 is fastened to the terminal strip 46 by means of screws 63 which also hold a strap 64 whose other end contacts with the collar 38. Thus an electrical path is maintained from the base of the exciter lamp 9 through the holder 35, shaft 36, the collar 38, through the strip 64 to the terminal 62.

We will now describe the method of adjusting the filament height of the exciter lamp so as to position it in a plane with the optical system. As is well known, the physical dimensions of lamps vary considerably, and particularly the vertical location of the filament. To overcome this we have provided an adjusting mechanism as follows:

A bracket 65 having three outwardly extending arms is secured to the upper end of the shaft 36. Three cone-pointed hand screws 66 are threadably engaged through the bracket 65 in a position directly over the exciter lamps. The ends of the screws 66 rest in detents in a floating collar 61 which in turn rests on top of the exciter lamps. A helical spring 68 is provided between the holder 35 and the collar 61 which maintains the collar against the screws 66.

By rotating any one of the hand screws 66, the vertical position of the respective exciter lamp 9 may be varied. As knob 40 is rotated and a lamp brought into the electrically energized position, the plunger 51 actuated by spring 56 forces the lamp into its adjusted position against collar 61.

The lamps are securely held on the holder 35 by means of two coiled springs 69 and set in grooves provided on the periphery of the holder. The springs 69 and 10 have sufiicient tension to securely hold the lamps against the shoulders 28 provided in the openings 32, 33 and 34, and still permit the insertion and removal of the lamps.

What is claimed is:

1. In a motion picture reproducing apparatus, the combination of a source of light of constant intensity, means for projecting a light beam from said source through said film to said light sensitive device, means for rotating said source of light in a horizontal plane in and out of operative position along the optical axis of said beam, and means for adjusting said light source in a plane parallel to said optical axis.

2. In a sound reproducer, a mounting for a plurality of light sources comprising a vertical shaft, a circular mounting positioned on said shaft having apertures therein for the insertion of said sources, a plate concentric of said shaft mounted above said sources and in contact with the tops thereof, and means individual to each source for moving sections of said plate longitudinally of said shaft for adjusting the individual positions of said sources vertically.

3. In a sound reproducer, an adjustable mounting for a plurality of lamps comprising a vertical shaft, a pair of plates concentric of said shaft and adapted to have said lamps mounted intermediate thereof, a spring, a fixed socket having a contact member mounted on said spring, means for moving each of said lamps into said socket individually, and means cooperating with said upper plate for adjusting the vertical position of said lamps in said socket with respect to said contact member.

4. In a sound reproducer, a lamp mounting for a plurality of lamps having a definite operating position comprising a vertical shaft, a base for said lamps mounted on said shaft, a plurality of apertures in said base adapted to hold the bases of said lamps therein, a fixed socket having a spring contact member, and means for rotating any one of said lamps about said shaft into engagement with said spring contact member.

5. In a sound reproducer, a lamp mounting for a plurality of lamps positioned thereon comprising, a shaft, a holder on said shaft having recesses therein to accommodate the bases of said lamps, means for maintaining said lamps in said recesses, a fixed socket adapted to contact said bases in one position of each of said lamps, means for predetermining the position of said lamps longitudinally of said shaft, and means for rotating said shaft and said lamps to bring said bases into contact with said socket at selected intervals.

6. In motion picture apparatus, the combination of an exciter lamp, a socket for said exciter lamp, a turret rotatable on a vertical axis for mounting said lamp and enabling the replacement of one lamp for another by the rotation of said turret carrying said lamps, and means for independently adjusting the vertical position of each lamp being replaced.

'1. In sound reproducing apparatus, the combination of an exciter lamp, a socket for said exciter lamp, a rotatable mounting enabling the replacement of one lamp for another by the rotation of said mounting, means for adjusting the vertical position of said lamp, a current conducting lamp engaging contact on said socket and a current conducting contact on said mounting for energizing said lamp when positioned in said socket.

8. In a sound reproducing apparatus, the combination of a lamp holder rotatable in a horizontal plane, a plurality of exciter lamps mounted in said holder, means for vertically adjusting the position of each of said lamps in said holder, means for supporting and rotating said holder to position each of said lamps in a predetermined definite relationship to a lens tube, and means for simultaneously adjusting all of said lamps along lines in respective vertical planes.

ERNEST ROSS. PAUL HAAS. 

